MIPS: Add support files for hugetlbfs.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 114 insertions, 0 deletions

diff --git a/arch/mips/include/asm/hugetlb.h b/arch/mips/include/asm/hugetlb.h
new file mode 100644
index 000000000000..f5e856015329
--- /dev/null
+++ b/arch/mips/include/asm/hugetlb.h
@@ -0,0 +1,114 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008, 2009 Cavium Networks, Inc.
+ */
+
+#ifndef __ASM_HUGETLB_H
+#define __ASM_HUGETLB_H
+
+#include <asm/page.h>
+
+
+static inline int is_hugepage_only_range(struct mm_struct *mm,
+                                         unsigned long addr,
+                                         unsigned long len)
+{
+        return 0;
+}
+
+static inline int prepare_hugepage_range(struct file *file,
+                                         unsigned long addr,
+                                         unsigned long len)
+{
+        unsigned long task_size = STACK_TOP;
+        struct hstate *h = hstate_file(file);
+
+        if (len & ~huge_page_mask(h))
+                return -EINVAL;
+        if (addr & ~huge_page_mask(h))
+                return -EINVAL;
+        if (len > task_size)
+                return -ENOMEM;
+        if (task_size - len < addr)
+                return -EINVAL;
+        return 0;
+}
+
+static inline void hugetlb_prefault_arch_hook(struct mm_struct *mm)
+{
+}
+
+static inline void hugetlb_free_pgd_range(struct mmu_gather *tlb,
+                                          unsigned long addr,
+                                          unsigned long end,
+                                          unsigned long floor,
+                                          unsigned long ceiling)
+{
+        free_pgd_range(tlb, addr, end, floor, ceiling);
+}
+
+static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+                                   pte_t *ptep, pte_t pte)
+{
+        set_pte_at(mm, addr, ptep, pte);
+}
+
+static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
+                                            unsigned long addr, pte_t *ptep)
+{
+        pte_t clear;
+        pte_t pte = *ptep;
+
+        pte_val(clear) = (unsigned long)invalid_pte_table;
+        set_pte_at(mm, addr, ptep, clear);
+        return pte;
+}
+
+static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
+                                         unsigned long addr, pte_t *ptep)
+{
+}
+
+static inline int huge_pte_none(pte_t pte)
+{
+        unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
+        return !val || (val == (unsigned long)invalid_pte_table);
+}
+
+static inline pte_t huge_pte_wrprotect(pte_t pte)
+{
+        return pte_wrprotect(pte);
+}
+
+static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
+                                           unsigned long addr, pte_t *ptep)
+{
+        ptep_set_wrprotect(mm, addr, ptep);
+}
+
+static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
+                                             unsigned long addr,
+                                             pte_t *ptep, pte_t pte,
+                                             int dirty)
+{
+        return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
+}
+
+static inline pte_t huge_ptep_get(pte_t *ptep)
+{
+        return *ptep;
+}
+
+static inline int arch_prepare_hugepage(struct page *page)
+{
+        return 0;
+}
+
+static inline void arch_release_hugepage(struct page *page)
+{
+}
+
+#endif /* __ASM_HUGETLB_H */